Linear seismic-acoustic system for detecting intruders in long and very narrow perimeter zones

A linear seismic-acoustic seismic system for detecting intruders in long and very narrow perimeter zones, comprising two elongated sensitive elements extending in a direction of their elongation and spaced from one another in a transverse direction so as to define therebetween an alarm zone which is narrower than a detection zone in which said sensitive elements are located and to produce signals when an intruded crosses said sensitive elements;

• a processing unit connected with said sensitive elements so as to receive a signal from the respective one of said sensitive element when an intruder crosses said sensitive element, and to process said signals to determine whether an intruder is in said detection zone or in said alarm zone;
• and an interface operative for outputting an output signal produced by said processing unit as a result of processing of said signals received from said sensitive elements.